Molecular Logic Operations Based on Surfactant Nanoaggregates

Abstract

Two molecular logic gates, FS1 and FS2, which display a UV and fluorescence behavior that is dependent on the pH value and the sodium dodecyl sulfate (SDS) surfactant concentration, are demonstrated based on the intramolecular charge-transfer mechanism. They are constructed according to the inorganic salts that induce transformation from premicelle to micelle. The absorption band of FS1 at 480 nm is significantly enhanced only when both SDS and Na(2)SO(4) are the input at high concentrations, in accordance with an AND logic gate. The OR logic function can be realized in a 3.5 mM SDS/FS2 aqueous solution with SDS and Na(2)SO(4) as inputs along with the emission intensity as output. Furthermore, half addition and half subtraction can be incorporated in FS1. This is facilitated by the surfactant, due to its versatility.

Controllable Self‐Assembly of Di(p‐methoxylphenyl)Dibenzofulvene into Three Different Emission Forms

“…When the concentration of CTAB is higher than 0.90 mM (CMC) micelles can be formed; under this condition the alkyl chains are densely arranged, and due to hydrophobic interactions molecules of 1 are included in the cavities of micelles of CTAB. In comparison, the alkyl chains of CTAB are less densely packed for the premicelles10 that are generated at low concentrations of CTAB; as a result the hydrophobic spaces available for molecules of 1 are comparably larger than those of the respective micelles. Accordingly, it is anticipated that molecules of 1 within the self‐assembly microrods with yellow‐green emission can adopt a less twisting conformation than those within the self‐assembly microrods with blue‐emission; thus, the former conformation possesses higher pi‐conjugation degree than the latter, being consistent with their difference in emission color.…”

“…The self‐assembly of 1 was carried out by injecting the ethanol solution of 1 into the aqueous solution containing CTAB. It is known that CTAB is a typical amphiphilic molecule which can form premicellar aggregates below the critical micelle concentration (CMC = 0.90 mM) and micelles over the critical micelle concentration 10. In fact, micelles of CTAB were utilized for assembly of several organic molecules into nanostructures with defined morphologies 11…”

Control of Noise in Chemical and Biochemical Information Processing

“…The output signals can be detected spectroscopically [88][89][90][91][92][93] or electrically/electrochemically. [94][95][96] Chemical computing can be done in the bulk, e.g., in solution, [97][98] or at surfaces/interfaces, [14-17,99-102[ such as at electrodes or on Si-chips. Supramolecular structures have also been considered as switchable devices for logic operations.…”

“Alive” dyes as fluorescent sensors: fluorophore, mechanism, receptor and images in living cells

“…Molecular logic gates are constructed according to the inorganic salts inducing transformation from premicelle to micelle. 48 The absorption band of 40 at 480 nm is significantly enhanced only when both SDS and Na 2 SO 4 are inputs at high concentrations, in accordance with an AND logic gate (Scheme 12). The OR logic function can be realized in a 3.5 mM SDS/41 aqueous solution with SDS and Na 2 SO 4 as inputs, along with the emission intensity as output.…”